I am not entering a debate that properly belongs to the US electorate, but I do not believe I am not being too sensitive, and certainly not ‘politically correct’ (a euphemism for not thinking, just sloganising), when I sense a whiff of prejudice in the approach of Mark, and his correspondents. If I am wrong; apologies.The point is that the free movement of labour, capital stocks and goods among nations makes good sense in the efforts to improve net wealth. This is the Smithian position on labour migration and I agree with it. It is about the only thing I can say that has been an unambiguous benefit of the European Union in recent years (my youthful illusions that there would be greater benefits from the original Common Market were, er, youthful illusions that came in touch with German and French real politique).